/**
 * MINAPL Compiler.
 * Copyright 2012 Michael A. Muller
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "Buffer.h"

#include <stdlib.h>
#include <string.h>

using namespace minapl;

Buffer::~Buffer(){
    free(allocPoint);
}

void Buffer::startToken() {
    if (start == end) {
        start = cur = allocPoint = (char *)malloc(1024);
        end = start + 1024;
    }
}

void Buffer::addChar(int ch) {
    if (cur == end) {

        // allocate a new buffer that is big enough to accomodate twice the
        // size that we've allocated so far.
        size_t newBufSize = 1024;
        while (cur - start > newBufSize / 2)
            newBufSize *= 2;

        char *oldStart = start;
        start = cur = (char *)malloc(newBufSize);

        memcpy(start, oldStart, end - oldStart);
        free(allocPoint);
        end = start + newBufSize;
        allocPoint = start;
    }
    *cur++ = ch;
}

